Crowning one rib at a time

[Michael Spreeman]

Space or no spcae, unless I start mass producing cookie cutter pianos, my preference is this system for the one by one control factor.
 
There is a photo set on the website photo gallery under soundboard pressing.  
 
We're pressing with panels around 5.5%MC. The shop typcially runs between 15% and 25% RH, so pressing time isn't a major concern. 
 
                Michael Spreeman http://www.spreemanpianoinnovations.com

> Date: Mon, 4 Aug 2008 19:56:27 +0100> From: ricb at pianostemmer.no> To: m_spreeman at hotmail.com; pianotech at ptg.org> Subject: Re: Crowning one rib at a time> > Ah... so its not so much a matter of crowning the board itself rib by > rib as it is a matter of installing ribs one at a time due to space > concerns and the ability to reposition ribs on the fly... yes ?? I > understand you dry your panels down quite a bit before installing the > ribs. How much working time do you allow for in getting all ribs > positioned and pressured after the panel comes out of the box ?> > I'd love to see a picture of your basic setup. We've seen several > variants posted here through the past few years. The more the > merrier... and the more enlightening as it were.> > Thanks for the reply> RicB> > Michael Spreeman wrote:> > Hi Ric,> > > > No problem. Some factories have presses with a slotted perimeter to > > position the ribs on the panel. They can do this because they are > > producing numerous boards with the same rib scale and layout. The > > presses have a frame with pre-positioned arms that come down to the > > ribs as a unit and are inflated all at the same time. Our press > > consists of several indivual units that are positioned one at a time. > > This allows us to enact changes in the rib layout from piano to piano > > without having to reconfigure a large fixed press. We have limited > > space in our shop, so another advantage to individual frames and > > cauls is the ability to store the presses in a small area when not > > being used. Also, our press frames have removable cauls which allows > > us to remove one caul and replace it with another of a different > > radius if desired.> >> > / Michael Spreeman> > /http://www.spreemanpianoinnovations.com > > <http://www.spreemanpianoinnovations.com/>> >> >> > ------------------------------------------------------------------------> > > Date: Mon, 4 Aug 2008 09:22:16 +0100> > > From: ricb at pianostemmer.no> > > To: pianotech at ptg.org; m_spreeman at hotmail.com> > > Subject: Crowning one rib at a time -- Spreeman> > >> > > Was reading about the Ravencroft instrument and have been curious about> > > many things since first hearing about it. On the website it says> > > somewhere that the soundboard is crowned "one rib at a time". I wonder> > > if you could be so kind as to expound on that a bit. Exactly how do you> > > crown a board one rib at a time ?> > >> > > Thanks if you can find the time to explain> > > Cheers> > > RicB> >> > ------------------------------------------------------------------------> > Get Windows Live and get whatever you need, wherever you are. Start > > here. > > <http://www.windowslive.com/default.html?ocid=TXT_TAGLM_WL_Home_082008>
_________________________________________________________________
Get Windows Live and get whatever you need, wherever you are.  Start here.
http://www.windowslive.com/default.html?ocid=TXT_TAGLM_WL_Home_082008
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080804/12f4ad98/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_0898.JPG
Type: image/jpeg
Size: 37592 bytes
Desc: not available
Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20080804/12f4ad98/attachment-0002.jpe 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 010.JPG
Type: image/jpeg
Size: 47495 bytes
Desc: not available
Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20080804/12f4ad98/attachment-0003.jpe